NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 4
·1960-1971
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IF 3.591
Wen He,Yongbo Xie,Qiang Yin,Zixuan Zhao,Lang Shi,Hongqing Wang
Scientists are still working on developing a “turn-on” fluorescence sensor for Co2+, especially in acidic solutions. A novel “on–off–on” fluorescence sensor based on g-C3N4 nanosheets was designed and prepared in this paper. It was able to detect (2-(5-bromo-2-pyridylazo)-5(diethylamino)phenol (abbreviated to 5-Br-PADAP) and Co2+ quantitatively by quenching and restoring the fluorescence of the g-C3N4 nanosheet system, respectively. Also discussed are the effects of solvent, pH, order of addition, and interaction time of 5-Br-PADAP and Co2+, as well as the concentration range of the object on measurement. Furthermore, in acidic conditions, the sensor demonstrated good selectivity and sensitivity. In the solvent system EtOH : H2O (v/v = 1 : 9, pH = 3), the fluorescence intensity had a good linear relationship with 5-Br-PADAP and Co2+ concentrations in the ranges of 0–15 μM and 0–10 μM, with low detection limits of 64 nM and 44 nM, respectively. Experiments and theoretical calculations were used to describe the interaction characteristics and sensing mechanism. It was eventually successful in detecting Co2+ in environmental samples.
研究领域:
分析化学
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材料科学
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环境科学
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DOI
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Fengyun Zhang,Yaoqi Wei,Yaping Zhang,Huanhuan Zhang,Lei Jiang,Xiangfei Liang
The 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP) spectrophotometric method is widely employed for uranium (U(VI)) determination due to its high sensitivity. However, conventional protocols require toxic sodium fluoride as both a masking agent and a stabilizer, posing environmental and operational risks. To address this limitation, we developed an eco-friendly alternative utilizing low-toxicity sodium dodecyl sulfonate (SDS) for dual-functional masking and stabilization. Critical parameters including pH, reagent stoichiometry, and reaction kinetics were systematically optimized. The Br-PADAP-U(VI) complex exhibited maximum absorbance at 576 nm (ε = 4.33 × 104 L mol−1 cm−1), with rapid color development and stable signal retention (>4 h) under ambient conditions. Linear Beer–Lambert compliance was observed within 0.0–4.0 μg per mL U(VI), yielding a Sandell sensitivity of 0.0055 μg cm−2. Notably, the method demonstrated exceptional tolerance toward coexisting ions (Na+, K+, Ca2+, Mg2+, Fe3+, Cl−, CO32−, and Cr2O72−). Validation via spike-recovery tests in environmental water samples achieved 96.4–104% recoveries (0.5%< RSD <2%), confirming the reliability for field-deployable U(VI) quantification with advantages of simplicity, rapidity, and accuracy.
研究领域:
分析化学
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环境化学
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光谱学
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核化学
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水质监测
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 10
·4667-4673
·
IF 3.3
Yufei Lei,Yujie Li,Chen Liu,Liqiong He,Qian Li,Lifu Liao,Xilin Xiao
A convenient and portable smartphone-assisted method for the colorimetric detection of uranyl ions (UO22+) in aqueous solutions is proposed using rifampicin and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP) as chromogenic agents. The addition of UO22+ would cause reaction with chromogenic agents to form complexes, changing the colour from orange to dark red in the rifampicin system and from yellow to light pink in the Br-PADAP system. To achieve the on-site estimation of the trace UO22+ concentration range, digital images of colour changes captured by the smartphone under fixed lighting conditions were imported into the built-in application named “Detect” to obtain HSV (hue, saturation, and value) and HSL (hue, saturation, lightness) information, which could be associated with the concentration of uranyl ions. For more precise laboratory-level detection, ultraviolet-visible (UV-vis) spectroscopy was employed as well. The absorbance of the rifampicin system exhibited strong linearity with the UO22+ concentration in the range from 4 to 50 μM at 375 nm with a method detection limit (MDL) of 3.17 μM by the UV-vis-based method, while that of Br-PADAP system had a linear relationship with the concentration from 0.9 to 7 μM at 562 nm with an MDL of 0.89 μM. The two strategies may be combined to detect UO22+ across a larger concentration range, and this method has been successfully used to analyze real samples including soil around uranium mines.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yun Zhu,Dawei Pan,Xueping Hu,Haitao Han,Mingyue Lin,Chenchen Wang
An electrochemical sensor based on reduced graphene oxide (rGO) and gold nanoparticles (AuNPs) modified electrode was utilized for determination of trace iron in coastal waters with the aid of the iron complexing ligand 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP). 5-Br-PADAP reacted with iron in short chelating reaction time (<3 min). rGO as a support provided large specific surface area for AuNPs, which would facilitate the electrochemical reduction of Fe(III)-5-Br-PADAP. Under the optimized conditions, the response of Fe(III) at this resulting sensor was linear in the range of 30 nM to 3 μM with a detection limit of 3.5 nM. This sensor also had excellent reproducibility and repeatability. Additionally, the modified electrode had been successfully applied to the determination of Fe(III) in real coastal waters.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-9
·
IF 4.122
Zhu Yun,Hu Xueping,Pan Dawei,Han Haitao,Lin Mingyue,Lu Yan,Wang Chenchen,Zhu Rilong
In this study, the speciation of iron (Fe), including total Fe (TFe) and acidified dissolved Fe (ADFe), was assessed by fast cathodic absorption stripping voltammetry, using a gold electrode and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) as a novel complexing agent for Fe. The validity and accuracy of this method were compared with the standard spectrophotometry and tested by the standard samples. Under optimized conditions, the Fe response was linear within the range of 0.01 to 1 μM with a detection limit of 1.2 nM. To further validate this method, the variation in concentrations of TFe and ADFe were investigated at twelve sampling stations in a local coastal river, in both the dry and wet season. Additionally, to further understand the interaction between Fe and environmental factors, the relationships between the concentration of Fe species and dissolved oxygen (DO) and salinity were also discussed.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Journal of Coatings Technology and Research
·
2025
·
IF 2.8
Ran Ke,Kang Fenghua,Zhou Wentao,Zhang Ziyuan,Li Yintao,He Zhiyu
The widely used indicator, 2-(5-bromo-2-pyridylazo)− 5-diethylaminophenol (Br-PADAP), can enable color tracing of radioactive contaminants when incorporated into strippable decontamination materials. However, its practical application is hindered by poor dispersion in aqueous substrates. To address this issue, this study prepared an amphiphilic diblock copolymer, PEA-b-PAA, using a one-pot synthesis method. Ethyl acrylate (EA) and acrylic acid (AA) were used as monomers, with S,S,S-trisulfanyl dibenzyl carbonate (DBTTC) serving as the initiator for reversible addition-fragmentation chain transfer (RAFT) polymerization. Test results demonstrated that block copolymers with EA:AA monomer ratios of 2:1, 1.5:1, and 1:1 effectively dispersed and stabilized the Br-PADAP indicator. Among these, the copolymer with a 1.5:1 monomer ratio, added at a concentration of 4%, improved the mechanical properties of the peelable decontamination material without compromising the color tracing function of Br-PADAP. This enhancement facilitates practical applications by enabling incorporation into aqueous peelable substrates, while maintaining the indicator’s color development mechanism. The resulting materials exhibit both effective decontamination and reliable color tracing capabilities.
研究领域:
高分子化学
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材料科学
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环境科学
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核技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）